Door-closing mechanism.



C. FORTH.

DOOR CLOSING MECHANISM.

APPLICATION FILED SEPT. 1. 1915.

Patented May 29,1917.

CHARLES ronrri, or OTTAWA, ONTARIO, CANADA.

DOOR-CLOSING MECHANISM.

Specification of Letters Patent.

Patented May 29, 1917'.

Application filed September 1, 1915. Serial No. 48,408.

To all whom it may concern:

Be it known that I, CHARLES FORTH, a citizen of the United States,residing at Ottawa, in the Province of Ontario and Dominion of Canada,have invented certain new and useful Improvements in Door-ClosingMechanism, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to mechanism, the object of the invention beingto provide for holding the door open in an adjusted open position orpositions against the action of the closing means; and

r? the invention consists broadly in means acting on relatively movableparts of a door closing mechanism, and operating to hold said partsagainst movement relatively to each other; whereby the door may be heldin an adjusted open position against the action of the closingmechanism.

The invention consists also in so construct ing the holding means thatthe door will be held yieldingly in open position; whereby if the doorbe pushed forcibly from its held position, no injury to the holdingmeans will result.

The invention consists further in so constructing the holding means thatthey may be adjusted or set to render them active or inactive at willwhereby the closing mechanism will be free to operate under normalconditions, or the door may be held open against the action of theclosing means.

Referring to the drawings:

Figure 1 is a top plan view of a door closing mechanism having myinvention em bodied therein, the said mechanism being shown in theposition it occupies when the.

door is in fullopen position.

Fig. 2 is a side elevation of the same partly in section, the holdingmeans being shown in active operative position.

Fig. 3 is a sectional view showing the said holding means adjusted torender the same inactive to permit the normal operation of the closingmechanism. 1

Figs. 4 and 5 are perspective views of de tails of the mechanism.

Fig. 6 is a to plan view of the inner pivotally connecte ends of thelinks of the door closin mechanism provided with my invention, the saidlinks being shown in the relative position they occupy when the door ispartially closed.

door closing In the accompanying drawings:

1 represents a barrel or cylinder adapted to be connected with a doorand provided with a closing spring (not shown), which acts to rotate ashaft or stud 52 mounted in the barrel and connected with the outer endof an arm 3. 4 represents a link whose outer end is adapted to bepivotally connected with the door frame as at 4 and whose inner end ispivotally connected with the inner end of the arm 3 by means of a pivotpin 5. The pivot pin extends vertically downward through alined openingsin the inner ends of the arm and link, and is pro-' vided 011 its upperend with a head 5 bearing against the upper side of the arm 3, and isextended at its lower end some dis tance below the lower sideof the linka which extended end .is threaded as at 5 Screwed on the threaded end ofthe pin is a hand wheel-or nut 6, and encircling the pin between the nutand the link 4: is a coiled spring 7, one end of which bears against thenut, while its other end bears against the under side of the link 4. Theends of the arm and link are recessed in their adjacent sides to receivea coiled spring 8 which surrounds the pivot pin and bears at one endagainst the bottom of the recess in the arm, and at its opposite endagainst the bottom of the recess in the link, the said pin beingprovided with a key'9 which seats in a slot in the link 4 to prevent thepin from turning therein. The inner adjacent sides of the ends of thearm and link, where they surround the pivot pin, are toothed as at 10,which teeth when the ends of the arm and link are forced together asshown in Fig. 2,

will interlock with each other and the arm,

and link will be held against relative pivotal motion, the said parts"when their toothed ends are'separated, as shown in Fig. 3, beingpermitted to pivot freely on each other about the axis of the pivot pinas a center.

In thenormal operation of the door closing mechanism, the toothed endsof the arm and link are separated from each other and maintainedyieldingly apart by the spring 8, the adjusting nut 6 being screwed outwardly on the pivot pin to permit the spring 8 to act. The arm and linkare now free to pivot on each other, in the movement of the door underthe influence of the closing motor. When now it is desired to bring theholding means into action, to hold the outer end to be connected withdoor in open position against the action of the mechanism, the adjustingnut 6 is screwed up on the pin as shown in Fig. 2, the result beingthat, through the medium of spring 7, which is stronger than the spring8, the inner end of link a will be forced into yielding engagement withthe inner end of the arm and will thereby compress the weaker spring 8and the teeth on said parts will be caused to interlock with each other.This will hold the arm and link against relative movement and willprevent the closing mechanism from operating to close the door.Consequently the latter may be held in different open positions. Due tothe fact that the teeth on the arm and link are held in engagement by aspring, if the door when held open is forcibly pushed either way, theend of link a will yield in the direction of the pivotal axis, and theteeth will click by each other, so that injury to the parts will beprevented. Furthermore, and by reason of the yielding clamping pressureapplied to hold the teeth in engagement, the door may be moved todifferent open positions, after once being adjusted, by forcibly pushingthereon.

It will be observed from the above description, that by one adjustmentof the nut G, the holding means will be brought into action and the.door may be held in different open positionsagainst the action of theclosing mechanism; and by another adjustment of the nut the holdingmeans will. be rendered inactive and the closing mechanism permitted tooperatenormally in closing the door. The adjusting nut being located onthe under side of the links as de scribed it is readily accessible frombeneath by reaching upwardly.

It will be manifest to the skilled mechanic that my invention in itsbroader aspect is applicable to other forms of door closing mechanismthan that shown, and may be embodied in other and differentconstructions than that mentioned without departing from the limits ofmy invention; and it will be understood that the invention is notlimited to any particular form or construction of the parts except in sofar as such imitations are specified in the claims.

Having thus described 'my invention, what I claim is:

1. In a door closing mechanism, the combination of a closing motoradapted to be connected with the door, an arm actuated by the motor, alink pivotally connected with. the outer end of the arm and adapted atits the door Gopies of this patent may be obtained for frame, theconnected ends of the arm and link being movable into and out ofengagement with each other in a direction axially of their connectingpivot, means tending to maintain the separation of said ends to permittheir free relative movements in the normal operation of the motor, andmanually operated means for clamping the ends of the arm and link inyielding engagement with each other to prevent the normal operation ofthe motor and to hold the door open, the said latter means beingoperable at will and independently of the movements of the door to holdthe door open in any desired position.

2. In a door closing mechanism, the combination of a closing motor, anarm actuated thereby, a link, a pivot pin connecting the arm and linktogether for relative pivotal movement, the adjacent faces of the armand link being provided with cooperating beveled teeth adapted whenengaged with each other to hold the parts against free relativemovement, and said arm and link being separable from each other axiallyof the pin to permit of their free relative movement, a springsurrounding the pin and bearing against the link, and a nut on the pinbearing against the spring; whereby the spring may be compressed orrelieved at will, to hold the parts yieldingly against relative movementor to permit their free relative movement, as desired.

3. In a door closing mechanism, the combination of a closing motor, anarm actuated thereby, a link, a pivot pin connectin the arm and linktogether for relative pivotal. movement, the adjacent faces of the armand link being provided with cooperating beveled teeth adapted whenengaged with each other to hold the parts against free relativemovement, and said arm and link being separable from each other axiallyof the pin to permit of their free relative movement, a springsurrounding the pin and bearing against the link, a nut on the pinbearing against the spring, whereby the spring may be compressed orrelieved at will, to hold the parts yieldingly against relative movementor to permit their free relative movement as desired, and a secondspring weaker than the first mentioned spring and arranged between thearm and link and acting to separate said parts when the first-mentionedspring is relieved.

In testimony whereof, I have affixed my signature.

CHARLES ronrn.

five cents each, by addressing the Commissioner of Patents, Washington,I). G.

